Plant Pathology - Study Mode

[#266] Grey spots of oat are caused by deficiency of
Correct Answer

(C) Mn

Explanation

Solution: Grey spots of oat are caused by a deficiency of Mn. Leaves of Manganese deficient oats plants show chlorotic spots and streaks which turn grey-white to brown and coalesce. Symptoms appear on younger and central leaves. Leaves are kinked or bent down when the spotting is intense. Plant growth is stunted.

[#267] Who discovered the downey mildew for the first time in India
Correct Answer

(A) E. J. Butler

Explanation

Solution: E. J. Butler discovered the Downey mildew for the first time in India. Sir Edwin John Butler was an Irish mycologist and plant pathologist. He became the Imperial Mycologist in India and later the first director of the Imperial Bureau of Mycology in England. During his twenty years in India, he began large-scale surveys on fungi and plant pathology and published the landmark book Fungi and Disease in Plants: An Introduction to the Diseases of Field and Plantation Crops, especially those of India and the East (1918) and has been called the Father of Mycology and Plant Pathology in India.

[#268] A cell placed in solution get deplasmolysed. The solution is
Correct Answer

(A) Hypotonic

Explanation

Solution: A cell placed in solution gets deplasmolysed. The solution is Hypotonic. Plasmolysis is the process in which cells lose water in a hypertonic solution. The reverse process, deplasmolysis or cytolysis, can occur if the cell is in a hypotonic solution resulting in a lower external osmotic pressure and a net flow of water into the cell.

[#269] Smuts and bunts are
Correct Answer

(A) Monocyclic

Explanation

Solution: Smuts and bunts are Monocyclic. Bunt, also called stinking smut, fungal disease of wheat, rye, and other grasses. Infection by Tilletia tritici causes normal kernels to be replaced by “smut balls” containing powdery masses of brownish black spores characterized by a dead-fish odour. Bunt and smut fungi can cause the most devastating disease of cereals. The zero or very low tolerance levels at receive centres can make diseased grain only saleable as low value stock feed. Fortunately, the regular use of seed applied fungicides (pickles) can cheaply and effectively control these diseases.

[#270] Elicitors are the pathogen components that determines its
Correct Answer

(B) Avirulence

Explanation

Solution: Elicitors are the pathogen components that determine its Avirulence. Elicitors are pathogen signal metabolites, recognized by plant cells, which trigger plant defenses. They are produced either by the pathogen or by plant cell components, such as the cell wall, upon hydrolyzing the action of the pathogen. Avirulence (Avr) genes exist in many fungi that share a gene-for-gene relationship with their host plant. They represent unique genetic determinants that prevent fungi from causing disease on plants that possess matching resistance (R) genes.